Well, I think you need to put movie files into your webserver exactly.
For example, wav, avi, mov, mpg files are similar to data files which run after completely downloaded to user's machine, however, asf, wma, wmv, ra.rm files so called streaming files run automatically from starting download.

Therefore, you need to install Windows Media Encoder in order to convert multi media files to streaming files, and you can get it from Microsoft Download Site.

Actually, I think there is an option when you encode the Quicktime file that determines when it starts playing. Like after 25% has downloaded, it starts to play while the rest of the file is still downloading. You have to tweak it so that it *appears* to stream. Play it too early and it will stop when it gets to the point where it's still downloading. Wait too long for it to load and it bores your viewers and doesn't appear to be streaming.

AFAIK, Quicktime doesn't stream like Windows Media, but you don't need a streaming server technology (reads spend more money) to deliver the video this way.

Check whatever application you used to encode the video and see if you can't configure it for progressive download and play.